When T'Pol tells Archer about the Vulcan agents sent to Agaron almost thirty years ago, he asks if she was one of them and she replies "I'm not that old." Well it turns out in Zero Hour that T'Pol is 65 at that point, which is only a year or so after this episode. So in point of fact she's easily old enough to have been an operative for the Vulcans almost thirty years ago.

Factoid :

Director David Livingston has directed no less than 54 Star Trek episodes making him Treks most prolific director.

Plotline

T'Pol gets a second chance to recapture a renegade Vulcan who escaped her nearly twenty years ago.